A sexual act where the girl lies down on her back with her top off and the guy stands over her, finishing on her chest. He then turns around and squats down, dropping his balls on to her chest as he rubs them in his own ejaculate towards her stomach, leaving a trail of semen similar to the wake of a steamboat. As he finishes rubbing his balls over her stomach, he pumps his fists and yells "woo wooooo!!"

During the act of sex when a man takes a dump on the chest of a women then places his head in between her breasts that are covered in feces and shakes his head back and forth very rapidly while making the "brrr" sound of a motorboat.

(sometimes refered to as a Cleveland Motorboat)

That girl was so kinky she let me give her a Cleveland Steamboat before I busted it all over her face.

Similar to the Cleveland Steamer. A guy squats down over a girls chest and defecates a huge steaming turd between her breasts. The man then "motorboats" the woman's breasts by moving his face back and forth between them and making a motor-like noise with his mouth, thus creating the Cleveland Steamboat.

"I was wondering why Mike's breath smelled shitty when he came home this morning..."
"Oh you didn't hear? He gave Caroline a Cleveland Steamboat and still had some shit on his chin!"